The U.S. uses the United States Customary System for units of measurement. The U.S. Customary Units remain the last widely used official non-metric system.

1inch = 2.54cm

1cm = 0.39inches

1m = 3.3 ft

1ft = 0.3 m

1km = 0.62 miles

1 mile = 1.6 km

1kg = 2.2lb

1lb = 0.45kg

1g = 0.035oz

1oz = 28g

(Source: www.worldwidemetric.com/metcal.htm)